Peroxy radicals in the summer free troposphere: seasonality and potential for heterogeneous loss
Peroxy radicals in the summer free troposphere: seasonality and potential for heterogeneous loss
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夏季自由对流层中的过氧自由基：季节性和异质损失的可能性
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
M. Steinbacher
中科院分区：
文献类型：
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作者：
A. Parker;P. Monks;K. Wyche;J. M. Balzani;J. Staehelin;S. Reimann;G. Legreid;M. Vollmer;M. Steinbacher
摘要。2005年夏末在少女峰（3580 m a.s.l）测量了过氧自由基（HO2+ΣiRiO2）和辅助微量气体的总和。这一时期的特点是大雪时间的延长，大雪期间观测到的过氧自由基的减少大于伴随的j（O1D）的减少。在极限条件下，过氧自由基的一阶损失率为0.0063 s−1，这可能归因于非均质损失过程。在无雪天，HCHO的光解作用是一个重要的过氧自由基来源。与以往的实验结果一致，绘制了从冬季到夏季过渡的过氧自由基浓度的季节变化趋势图。夏末少女峰的臭氧净产量为净中性或轻度臭氧破坏性。计算了无雪日臭氧补偿点的值为28±4 pptv。
Abstract. The sum of peroxy radicals (HO2+ΣiRiO2) and supporting trace gases were measured on the Jungfraujoch (3580 m a.s.l.) during the late summer of 2005. The period was marked by extended times of heavy snow which led to reduction in the observed peroxy radicals during the snowy periods that was greater than the concomitant reduction in j(O1D). In the limit a first order loss rate of 0.0063 s−1 can be derived for the peroxy radical loss in the snowy conditions that could be potentially ascribed to a heterogenous loss process. On snow free days photolysis of HCHO is shown to be a significant peroxy radical source. The seasonal trends of the peroxy radical concentrations have been mapped from the winter to summer transition in line with previous experiments. Net ozone production in late summer at the Jungfraujoch was net neutral to marginally ozone destructive. A value of 28±4 pptv is calculated for the ozone compensation point for the snow free days.